One user can acess openfire while others cannot

why is it that one user cannot to loging into a openfire ad connected server, while others can, he keeps getting incorrect user and passwords message, while the same credentials work in the actuall login.

Im having the same problem, but I have narrowed it down to users with å ä ö in there password won’t be able to login. I have tried another client then spark and then managed to sign in, so I guess the problem is not in Openfire.

Do any one have any tips or suggestions to how I can get around this problem?